* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

#app {
    width: 100%;
    height: 100vh;
    overflow: hidden;
    background-color: antiquewhite;
    display: flex
}

.nav {
    margin: auto;
    display: flex;
    align-items: center;
}
.nav div{
    width: 80px;
    height:80px;
    text-align: center;
    line-height: 80px;
    background-color: #78cff8;
    margin: 15px;
    z-index: 0;
    position: relative;
    border-radius: 5px;
    color: #fff;
}
 .active{
    width: 100%;
    height: 100%;
    background-color: #78cff8;
    z-index: -1;
    position: absolute;
    left: 0;
    top: 0;
    border-radius: 50%;
    transition: all 1s;
}

.nav div:hover > .active{
    transform: rotate(-20deg) rotate(65deg);
    border-radius: 0;
   overflow:visible;

}
